org.apache.hadoop.hive.ql.optimizer.calcite.rules

Class HiveSubQueryRemoveRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveSubQueryRemoveRule

public class HiveSubQueryRemoveRule
extends org.apache.calcite.plan.RelOptRule

NOTE: this rule is replicated from Calcite's SubqueryRemoveRule Transform that converts IN, EXISTS and scalar sub-queries into joins. TODO: Reason this is replicated instead of using Calcite's is Calcite creates null literal with null type but hive needs it to be properly typed

Sub-queries are represented by RexSubQuery expressions.

A sub-query may or may not be correlated. If a sub-query is correlated, the wrapped RelNode will contain a RexCorrelVariable before the rewrite, and the product of the rewrite will be a Correlate. The Correlate can be removed using RelDecorrelator.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HiveSubQueryRemoveRule.HiveSortLimitRemover

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Method Summary

Modifier and Type	Method and Description
protected org.apache.calcite.rex.RexNode	apply(org.apache.calcite.rel.metadata.RelMetadataQuery mq, org.apache.calcite.rex.RexSubQuery e, Set<org.apache.calcite.rel.core.CorrelationId> variablesSet, org.apache.calcite.plan.RelOptUtil.Logic logic, org.apache.calcite.tools.RelBuilder builder, int inputCount, int offset, boolean isCorrScalarAgg)
static org.apache.calcite.plan.RelOptRule	forFilter(HiveConf conf)
static org.apache.calcite.plan.RelOptRule	forProject(HiveConf conf)
void	onMatch(org.apache.calcite.plan.RelOptRuleCall call)
static void	subqueryRestriction(org.apache.calcite.rel.RelNode relNode)

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

forProject

public static org.apache.calcite.plan.RelOptRule forProject(HiveConf conf)

forFilter

public static org.apache.calcite.plan.RelOptRule forFilter(HiveConf conf)

onMatch

public void onMatch(org.apache.calcite.plan.RelOptRuleCall call)

Specified by:

onMatch in class org.apache.calcite.plan.RelOptRule

apply

protected org.apache.calcite.rex.RexNode apply(org.apache.calcite.rel.metadata.RelMetadataQuery mq,
                                               org.apache.calcite.rex.RexSubQuery e,
                                               Set<org.apache.calcite.rel.core.CorrelationId> variablesSet,
                                               org.apache.calcite.plan.RelOptUtil.Logic logic,
                                               org.apache.calcite.tools.RelBuilder builder,
                                               int inputCount,
                                               int offset,
                                               boolean isCorrScalarAgg)

subqueryRestriction

public static void subqueryRestriction(org.apache.calcite.rel.RelNode relNode)